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Florentius is first heard of when he arrives in Gaul as a praetorian
prefect of Constantius II in 357. He spoke in
support of engaging the enemy as the battle of
Strasbourg loomed.[1] Later
that year when revenue from Gaul did not reach desired levels from
the poll-tax and the land-tax, he took measures to raise special
levies to make up for the shortfall. However, Julian opposed the
imposition of the extra burden on the people of Gaul and
Constantius decided against the policy of his own prefect.[2]

Florentius nevertheless continued as prefect in Gaul until early
in 360, when an order came from Constantius for Gallic troops to be
sent to the eastern front. The order, Ammianus
Marcellinus believed, was at the instigation of Florentius,[3] who
unaccountably withdrew to Vienne and busied himself there, Ammianus
believing that this was anticipating the disturbances following the
arrival of the order.[4] And
when Florentius heard that Julian had been raised to Augustus, he
abandoned Gaul and sought out Constantius.[5]

Constantius must have held him in high regard for first he
appointed him praetorian prefect of Illyricum when
Anatolius died, then made him a consul in 361.[6] When
Julian's rebellion broke out, Florentius fled Italy.[7] Not
long after Julian became emperor a tribunal was set up at Chalcedon
early in 362, which condemned Florentius to death in absentia.[8] When
two former members of the secret service offered to point out to
Julian where Florentius was hiding, Julian rebuked them as
informers and refused to hear more, preferring to leave him hiding
in fear.[9]

Florentius is first heard of when he arrives in Gaul as a praetorian prefect of Constantius II in 357. He spoke in support of engaging the enemy as the battle of Strasbourg loomed.[1] Later that year when revenue from Gaul did not reach desired levels from the poll-tax and the land-tax, he took measures to raise special levies to make up for the shortfall. However, Julian opposed the imposition of the extra burden on the people of Gaul and Constantius decided against the policy of his own prefect.[2]

Florentius nevertheless continued as prefect in Gaul until early in 360, when an order came from Constantius for Gallic troops to be sent to the eastern front. The order, Ammianus Marcellinus believed, was at the instigation of Florentius,[3] who unaccountably withdrew to Vienne and busied himself there, Ammianus believing that this was anticipating the disturbances following the arrival of the order.[4] And when Florentius heard that Julian had been raised to Augustus, he abandoned Gaul and sought out Constantius.[5]

Constantius must have held him in high regard for first he appointed him praetorian prefect of Illyricum when Anatolius died, then made him a consul in 361.[6] When Julian's rebellion broke out, Florentius fled Italy.[7] Not long after Julian became emperor a tribunal was set up at Chalcedon early in 362, which condemned Florentius to death in absentia.[8] When two former members of the secret service offered to point out to Julian where Florentius was hiding, Julian rebuked them as informers and refused to hear more, preferring to leave him hiding in fear.[9]